A good policy would be to remove all cookies on shutting the browser…but again a lot of tracking goes on via other ways like for instance webbugs.
See what you find with web bug detector extension enabled on Google Chrome…
Tracking is going on in so many ways that only a script blocker like NoScript in combination with Request Policy or ScriptSafe and KissPrivacy in Google Chrome can block, and do not forget to enable Google Sharing and GDisconnect extension for enhanced privacy from Google tracking as I launch Google Chrome from Chrome PrivacyGuard
polonus